(c) The countries of south America and Africa
Florida has alot of air pockets underneath the ground. I've watched a documentary on the weather channel before. Air pockets below the ground slowly erode and eventually open up at the top layer of the ground, causing the earth to open up.
Answer:
gravity
Explanation:
streams erode dirt and rocks, transport the sediment, and redeposit it in new locations shaping the earths surface into a system of stream valleys. streams now flow downhill due to the force of gravity
The tanks is unfit for consumption
